From fad4bbc517ef2a55988f0fd7874d98dbc5303b14 Mon Sep 17 00:00:00 2001
From: Philipp Maier <pmaier@sysmocom.de>
Date: Mon, 28 Jan 2019 16:28:42 +0100
Subject: bsc_vty: add features to disable specific lchans via vty

In some test and debug situations it is useful to have the ability to
lock certain lchans in a way that the BSC can not allocate them. One
application might be to simulate an exhaustion of all TCH/H channels in
order to force the BSC to take one of the available TCH/F.

Lets add a command to the vty which alloes us sen lchans from
LCHAN_ST_UNUSED
to LCHAN_ST_BORKEN and vice versa.

Change-Id: I397e68e26d6a1727890353fa34f4897b54795866
Related: OS#3503
---
 src/osmo-bsc/bsc_vty.c   | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 src/osmo-bsc/lchan_fsm.c |  1 +
 2 files changed, 48 insertions(+)

diff --git a/src/osmo-bsc/bsc_vty.c b/src/osmo-bsc/bsc_vty.c
index 3830475bd..357ee9eae 100644
--- a/src/osmo-bsc/bsc_vty.c
+++ b/src/osmo-bsc/bsc_vty.c
@@ -4788,6 +4788,51 @@ DEFUN(lchan_act, lchan_act_cmd,
 	return CMD_SUCCESS;
 }
 
+/* Debug command to send lchans from state LCHAN_ST_UNUSED to state
+ * LCHAN_ST_BORKEN and vice versa. */
+DEFUN_HIDDEN(lchan_set_borken, lchan_set_borken_cmd,
+	     "bts <0-255> trx <0-255> timeslot <0-7> sub-slot <0-7> (borken|unused)",
+	     BTS_NR_TRX_TS_SS_STR2
+	     "send lchan to state LCHAN_ST_BORKEN (for debugging)\n"
+	     "send lchan to state LCHAN_ST_UNUSED (for debugging)\n")
+{
+	struct gsm_bts_trx_ts *ts;
+	struct gsm_lchan *lchan;
+	int ss_nr = atoi(argv[3]);
+	ts = vty_get_ts(vty, argv[0], argv[1], argv[2]);
+	if (!ts)
+		return CMD_WARNING;
+	lchan = &ts->lchan[ss_nr];
+	if (!lchan->fi)
+		return CMD_WARNING;
+
+	if (!strcmp(argv[4], "borken")) {
+		if (lchan->fi->state == LCHAN_ST_UNUSED)
+			osmo_fsm_inst_state_chg(lchan->fi, LCHAN_ST_BORKEN, 0, 0);
+		else {
+			vty_out(vty,
+				"%% lchan is in state %s, only lchans that are in state %s may be moved to state %s manually%s",
+				osmo_fsm_state_name(lchan->fi->fsm, lchan->fi->state),
+				osmo_fsm_state_name(lchan->fi->fsm, LCHAN_ST_UNUSED),
+				osmo_fsm_state_name(lchan->fi->fsm, LCHAN_ST_BORKEN), VTY_NEWLINE);
+			return CMD_WARNING;
+		}
+	} else {
+		if (lchan->fi->state == LCHAN_ST_BORKEN)
+			osmo_fsm_inst_state_chg(lchan->fi, LCHAN_ST_UNUSED, 0, 0);
+		else {
+			vty_out(vty,
+				"%% lchan is in state %s, only lchans that are in state %s may be moved to state %s manually%s",
+				osmo_fsm_state_name(lchan->fi->fsm, lchan->fi->state),
+				osmo_fsm_state_name(lchan->fi->fsm, LCHAN_ST_BORKEN),
+				osmo_fsm_state_name(lchan->fi->fsm, LCHAN_ST_UNUSED), VTY_NEWLINE);
+			return CMD_WARNING;
+		}
+	}
+
+	return CMD_SUCCESS;
+}
+
 DEFUN(lchan_mdcx, lchan_mdcx_cmd,
 	"bts <0-255> trx <0-255> timeslot <0-7> sub-slot <0-7> mdcx A.B.C.D <0-65535>",
 	BTS_NR_TRX_TS_SS_STR2
@@ -5264,6 +5309,8 @@ int bsc_vty_init(struct gsm_network *network)
 	install_element(ENABLE_NODE, &pdch_act_cmd);
 	install_element(ENABLE_NODE, &lchan_act_cmd);
 	install_element(ENABLE_NODE, &lchan_mdcx_cmd);
+	install_element(ENABLE_NODE, &lchan_set_borken_cmd);
+
 	install_element(ENABLE_NODE, &handover_subscr_conn_cmd);
 	install_element(ENABLE_NODE, &assignment_subscr_conn_cmd);
 	install_element(ENABLE_NODE, &smscb_cmd_cmd);
diff --git a/src/osmo-bsc/lchan_fsm.c b/src/osmo-bsc/lchan_fsm.c
index 70f762225..8b4cf6d7b 100644
--- a/src/osmo-bsc/lchan_fsm.c
+++ b/src/osmo-bsc/lchan_fsm.c
@@ -1115,6 +1115,7 @@ static const struct osmo_fsm_state lchan_fsm_states[] = {
 		.out_state_mask = 0
 			| S(LCHAN_ST_WAIT_TS_READY)
 			| S(LCHAN_ST_CBCH)
+			| S(LCHAN_ST_BORKEN)
 			,
 	},
 	[LCHAN_ST_CBCH] = {
-- 
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